684392 has 8 divisors (see below), whose sum is σ = 1283250. Its totient is φ = 342192.

The previous prime is 684379. The next prime is 684407. The reversal of 684392 is 293486.

It can be written as a sum of positive squares in only one way, i.e., 682276 + 2116 = 826^2 + 46^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 684392.

It is an unprimeable number.

684392 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42767 + ... + 42782.

2⁶⁸⁴³⁹² is an apocalyptic number.

It is an amenable number.

684392 is a deficient number, since it is larger than the sum of its proper divisors (598858).

684392 is a wasteful number, since it uses less digits than its factorization.

684392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85555 (or 85551 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 684392 is about 827.2798800890. The cubic root of 684392 is about 88.1255096126.

The spelling of 684392 in words is "six hundred eighty-four thousand, three hundred ninety-two".